Aquarium pumps circulate air through the tank to supply oxygen to the fish. They also keep the water flowing to the filter to remove contaminants, such as food crumbs and fish waste. They may be installed inside the tank or mounted externally. Both types run on mains power and produce a specific amount of heat depending on their wattage. Most aquariums use one pump, but others have a secondary pump for backup or additional power.
Submersible Aquarium Pumps are placed inside the tank, usually close to the ceiling. They are housed in water-resistant casings made of synthetic materials, such as polypropylene. They may also be integrated with filters or filter modules.
External Aquarium Pumps are installed outside the tank, except for a small hose delivering pressure to the water. They are ideal for small aquariums with limited space to accommodate a tank and filter.
Size. Make sure your aquarium pump is appropriate for the size of your tank. Larger, more powerful tanks generate a lot of heat and raise the temperature to unsafe levels. Have your tank fitted for the right pump, or get a tank with a preinstalled pump.
Turnover rate. This refers to the number of times the water circulates for a given period. Choose an aquarium pump with a high turnover rate to ensure a constant supply of air and clean water. Closed aquariums usually require a higher turnover rate than open ones.
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